Understanding files,directories, owners
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Highlights:
- File manipulations
- Directory manipulations
- Access modifications

Files:
- renamed:    intermediate_PHP_techniques/access_modifiers.php -> intermediate-PHP-techniques/access_modifiers.php
- renamed:    intermediate_PHP_techniques/cloning.php -> intermediate-PHP-techniques/cloning.php
- renamed:    intermediate_PHP_techniques/comparison.php -> intermediate-PHP-techniques/comparison.php
- renamed:    intermediate_PHP_techniques/constructor.php -> intermediate-PHP-techniques/constructor.php
- new file:   intermediate-PHP-techniques/file-access.php
- new file:   intermediate-PHP-techniques/file-basics.php
- new file:   intermediate-PHP-techniques/file-changer.php
- new file:   intermediate-PHP-techniques/file-delete.php
- new file:   intermediate-PHP-techniques/file-details.php
- new file:   intermediate-PHP-techniques/file-dir-contents.php
- new file:   intermediate-PHP-techniques/file-directories.php
- new file:   intermediate-PHP-techniques/file-permissions.php
- new file:   intermediate-PHP-techniques/file-pointer.php
- new file:   intermediate-PHP-techniques/file-read.php
- new file:   intermediate-PHP-techniques/file-test.php
- new file:   intermediate-PHP-techniques/file-write.php
- renamed:    intermediate_PHP_techniques/parent.php -> intermediate-PHP-techniques/parent.php
- renamed:    intermediate_PHP_techniques/references.php -> intermediate-PHP-techniques/references.php
- renamed:    intermediate_PHP_techniques/server_variables.php -> intermediate-PHP-techniques/server-variables.php
- renamed:    intermediate_PHP_techniques/static_modifier.php -> intermediate-PHP-techniques/static-modifier.php